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Debt Avalanche vs Snowball Calculator

See how much interest you save and how many months faster you pay off debt with each strategy.

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Interest saved (avalanche vs snowball)

$0.00

Avalanche saves this vs snowball.

Detailed results
Avalanche payoff (months)46
Snowball payoff (months)46
Avalanche total interest$4,386
Snowball total interest$4,386
Months faster (avalanche)0

What this result means

Interest saved (avalanche vs snowball): $0.00.

For these debts, both strategies produce the same payoff time and total interest.

Monthly Payoff Schedule

Balance remaining each month for the avalanche strategy.

Monthly Payoff Schedule. 47 rows, first 12 shown.
MonthDebt 1 BalanceDebt 2 BalanceTotal Balance
1$7,733$14,794$22,527
2$7,462$14,586$22,048
3$7,186$14,377$21,564
4$6,906$14,167$21,073
5$6,621$13,956$20,577
6$6,331$13,743$20,074
7$6,037$13,529$19,566
8$5,737$13,313$19,051
9$5,433$13,097$18,530
10$5,124$12,879$18,002
11$4,809$12,659$17,468
12$4,489$12,438$16,927

How this is calculated

Avalanche: direct extra payment to highest-rate balance. Snowball: direct extra payment to lowest balance. Monthly interest = balance × rate/12.

Two popular frameworks exist for paying down multiple debts: the avalanche and the snowball.

Avalanche (mathematically optimal). Direct all extra payments to the highest-interest-rate debt while making minimums on others. When it's paid off, roll that payment to the next highest-rate debt. This minimizes total interest paid — the highest-rate debt is the most expensive dollar-for-dollar, so eliminating it first saves the most money.

Snowball (psychologically driven). Target the smallest balance first, regardless of interest rate. The quick win of eliminating an account can build momentum and motivation — studies suggest some people are more likely to stay on track when they experience early victories.

When do they produce the same result? If all debts have the same interest rate, or if you only have one debt, both strategies are identical.

The real cost of the snowball. In most scenarios with different interest rates, the avalanche saves both interest and time. The snowball's cost is the extra interest paid by ignoring the high-rate debt while focusing on a lower-rate small balance.

Combining strategies. Some people use a hybrid: pay off the smallest balance first if it's close to elimination (e.g., 2–3 months away), then switch to avalanche discipline for the remaining debts.

Assumptions

  • Interest accrues monthly (monthly rate = annual rate ÷ 12).
  • Minimum payments remain fixed throughout the payoff period.
  • No new charges are added to either debt.
  • The full minimum payment is applied each month before extra payments.
  • Simulation caps at 50 years (600 months) to prevent infinite loops.

Frequently asked questions

›Which method pays off debt faster?

The avalanche method mathematically always pays off debt faster and with lower total interest paid. By attacking the highest-rate debt first, you eliminate the most expensive interest accrual earliest. The snowball may take months or years longer if the smallest balance happens to be the lowest-rate debt. Unless all debts carry the same interest rate, avalanche is the superior financial strategy. The only argument for snowball is psychological motivation from quick wins.

›Does the snowball method cost more?

Yes, almost always. By ignoring high-rate debt while focusing on a low-rate small balance, you pay hundreds or even thousands of dollars in extra interest. For example: $8k credit card at 20% vs. $15k auto loan at 7%. Snowball tackles the $8k first, but the $15k auto loan keeps accruing expensive interest the whole time. The cost difference depends on balance sizes and rate spreads — it can range from negligible (similar rates) to $5k+ (large spreads). Avalanche saves significantly in realistic scenarios.

›What if I can barely make minimums?

First priority: make all minimum payments on every debt to avoid late fees, credit damage, and collections. Late fees and credit score hits are costlier than interest savings. Once you can scrape together even $25–50/month extra, direct it to the highest-rate debt — this small amount compounded over months still saves meaningful interest. Consider negotiating lower rates (call your card issuer, ask for a hardship rate), exploring side income, or consulting a nonprofit credit counselor.

›Should I include student loans?

Yes, include all student loans as separate debts using their individual balances, rates, and minimum payments. For federal student loans, you have an extra choice: if your income is lower than the standard payment, income-driven repayment (IDR) may result in lower payments than the avalanche strategy suggests — see the income-driven repayment comparison calculator to determine which path is better for your situation.

›What about balance transfer cards?

A 0% introductory balance transfer can powerfully accelerate payoff. During the 0% promo period (typically 6–21 months), interest doesn't accrue, so every dollar of payment goes straight to principal. Model this as a debt with 0% rate for the promo duration. The avalanche and snowball strategies converge when comparing a 0% card to another 0% source — prioritize the 0% card first, then it's paid off interest-free before the promo expires.

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